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Old 02-29-2012, 07:03 AM
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Welding 404 stainless, choice of wire?

Guys, I am planning on making a grill insert for my 33Ply. and I have purchased some 404 3/16" stainless rods. (they were pretty economical) I have shaped the outside perimiter frame out of 1/4" reg. steel rod. My question is, can I use the regular wire for soft metal that is loaded in my MIG to weld the stainless rods to the mild steel 1/4" framework or do I need a special wire? I think all that will be neccessary is to "tack" them top & bottom to hold them in place and the joints will be out of sight. Thanks, Bob

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Old 02-29-2012, 07:30 AM
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welding stainless to carbon steel

You need to use 309. It is a bimetal rod used to weld stainless to carbon.Get you some 3/32" stick rods and tack the piecies togeather. That way you won't have to buy a whole spool of wire. If you can't find the 309 you can use any stainless stick rod they will all weld to the carbon steel.
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Old 02-29-2012, 11:34 AM
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S/s

Hi,dont forget to polish the S/S BEFORE you weld it,and put a couple of wraps of DUCT tape close to where the welds will be..........
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Old 02-29-2012, 08:09 PM
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Quote:
Originally Posted by boatbob2
Hi,dont forget to polish the S/S BEFORE you weld it,and put a couple of wraps of DUCT tape close to where the welds will be..........
Thanks boatbob2. I never heard anything about polishing before welding. Could you educate me a little, I'm curious. I'm kinda thinking that the welding burnishes the stainless or something? Bob
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Old 03-01-2012, 11:14 AM
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Polishing......

A lot of the S/S tubing or rod is not polished when you buy it,so,if you polish it to a nice shine ,then using Duct Tape,around close to where you are welding,the S/S wont change color too much (turn blue from heat). it also will be too hard to shine it after welding...
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Old 03-01-2012, 11:25 AM
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if you weld the ss rods with mild steel wire you will have rust, it will creep all around the ss rods eventually.
we use 316 mig wire for 304 ss exhaust systems, you can buy a 2 lb roll for about $30.
you will also need argon/co2 75/25 gas to weld ss.

i think boatbob is suggesting pre-polishing the rods because it is easy to polish rods vs an assembly.
rods will polish on a buffing wheel, you will need to re-polish the joints.

some alternatives, if you have a torch, is gas weld with ss or braze if the welds will not show.
weld spatter will make a mess on polished ss, we use anti-spatter spray, but i've hear pam cooking spray work too.
i would also cover everything with cardboard. duct tape works too but it is a pain to remove burnt glue.

cutoff wheels and grinding disks that have been used on mild steel will also cause rust and contamination in your welds.
use new disks when cutting, grinding and sanding.
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Old 03-01-2012, 02:02 PM
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I thank you all, a lot of good info that I didn't know.
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